Delivering system for paper-making machine



Nov. 10,, 1970 P. F. SPRINGUEL DELIVERING SYSTEM FOR PAPER-MAKING MACHINE Filed July 26, 1966 2 Sheets-Sheet 1 Ill 40095 P401. FEM/c015 .SPAINGUH. Mo/W 60/; L AMM a/m/rm/w Jcal $0.611

NOV. 10, 1970 SPRINGUEL ETAL 3,539,447

DELIVERING SYSTEM FOR PAPER-MAKING MACHINE Filed July 26. 1966 2 Sheets-Sheet 2 INVfM-rans P401- fRfll/CD/S Pk/lava Ema/v0 60/144! 61/61/724!!! y co Z .l uu/v, 41-114 5 United States Patent M 3,539,447 DELIVERING SYSTEM FOR PAPER-MAKING MACHINE Paul Francois Springuel, Ohain, and Edmond Guillam Chantraine, Antheit, Belgium, assignors to Paul Francois Springuel, Ohain, Belgium, and S.A. Thiry & Co., Huy, Belgium Filed July 26, 1966, Ser. No. 567,943 Claims priority, application Belgium, July 28, 1965, 667,576 Int. Cl. D21f 1/06 US. Cl. 162-336 2 Claims ABSTRACT OF THE DISCLOSURE A delivering system for fibers in suspension for a papermaking machine comprising a vertical collector having a circular wall and a bottom, a pulp feed tube extending into the collector, the collector having an anti-splash ring surrounding the feed tube and forming an annular chamber with the collector wall, and a plurality of distributor tubes connected to said annular chamber for distributing inlet feed to a headbox over the width thereof.

The present invention relates to a new delivering system for a paper-making machine or a machine for making cardboard or the like fibrous product in general, of the Fourdrinier type or the like, with a view to improving the uniformity of supply to the headbox of the said machine.

Various delivering systems are already known which are designed to provide uniform distribution of the pulp supply and prevent flocculation, for example US Pat. No. 2,920,699 of P. A. Fasoli, but so far, it has not been possible with these systems to obtain sufiicient uniformity across the headbox.

To overcome this disadvantage, it appeared of interest to construct a new delivering system which provides great uniformity of delivery across the headbox regardless of the rate of delivery and by means of which it is easy to obtain an indication of the volumetric value of the feed and consequently the volumetric amount for a given production.

According to the invention, the delivering system, of the type comprising a vertical collector disposed in the axis of the machine and a series of tubes which distribute the inlet feed over the width of the machine, is characterised in that the collector is open to the atmosphere or closed and then subjected to a vacuum or to pressure and is constructed in such a way that the pulp inlet tube dips into its upper part and its base has a certain number of apertures from which the distributor tubes extend, which tubes are connected to the entry part of the headbox of the machine and all have the same charge loss, i.e. reduction in fluid pressure circulated in a tubular connector.

According to a further feature of the invention, the pulp inlet tube or feed tube dips right down to the base of the collector on which is mounted an anti-splash ring which surrounds the said feed tube concentrically and at a certain distance from it.

Also according to the invention, the apertures provided in the base of the collector are in the annular chamber formed by the anti-splash ring and the collector tube on one or more circumferences concentric with the said collector and at equidistant intervals apart.

According to a further feature of the invention, the whole arrangement of distributor tubes extending from the apertures at the base of the collector is directed down Wardly along an imaginary line parallel to the axis of the head roller of the machine or any other roller if the machine does not have a head roller, and starting from 3,539,447 Patented Nov. 10, 1970 this imaginary line, the said tubes are parallel to each other and to the axis of the machine.

To keep the streams of liquid described above parallel to each other, the invention further consists in partitioning the inlet part of the headbox of the paper-making machine into tube compartments.

According to the invention, it also appeared advantageous to construct the pulp inlet in such a manner that it comes from a box at constant level, the outlet aperture of which is arranged in the axis of the collector.

According to another feature of the invention, the flow control valve is arranged at the base of the pulp feed pipe in the base of the collector.

To enable the invention to be more easily understood, it will now be described, solely by way of example, with reference to the attached drawing in which:

FIG. 1 is a diagrammatic plan view of the delivering system according to the invention, connected to a headbox of a paper-making machine.

FIG. 2 is an elevational section through the delivering system of FIG. 1 taken along the line X-Y.

FIG. 3 is an elevational section of the inlet part to the headbox in a particular embodiment which forms part of the system according to the invention.

FIG. 4 is a partial section through the line 44 of FIG. 3.

FIG. 5 is a diagrammatic elevational section of a dif ferent embodiment of the delivering system according to the invention.

As will be seen in FIGS. 1 and 2, the delivering system consists of a vertical collector or collector pipe 1 open to the atmosphere, in the upper part of which is the usual pulp inlet tube 2 which is used in all paper-making machines, this tube being extended axially into the said collector by a feed tube 3. On the tube 2 is inserted a flow control valve 4. It must be understood that this flow valve 4 may be replaced by a valve mounted on a system of pipes which may be a system of recycling pipes. The said collector is situated along the axial plane X-Y of the paper-making machine.

At the base of the collector 1 is mounted an anti-splash ring 5 which is concentric to the said collector and surrounds the feed tube 3 at a certain distance from it. At the base of the collector and in the annular chamber 6 made by the anti-splash ring 5 and collector 1 there are further provided a certain number of apertures 7 equipped with nozzles 7 which project downwards. These apertures 7, which are here six in number, are arranged on the circumference of a circle which is concentric to the said collector and to the ring, and they are equidistant. In the case where these apertures are more numerous, they could be arranged on several concentric circles.

To each nozzle 7 is attached a distributor tube 8. These tubes 8 extend downwards and they all have the same charge loss and are arranged in such a way that they are distributed over an imaginary line AA parallel to the axis of the head roller 9 of the machine, which line AA may be situated underneath the collector or under the headbox 10 which is shown fragmentarily, or at a certain distance between the said collector and the headbox.

The tubes 8 thereafter extend strictly parallel to each other and to the axial plane XY of the machine to open into the headbox inlet 11.

A delivering system for a paper-making machine according to the invention functions as follows:

The pulp arriving from the feed tube 3 ascends in the collector 1 to flow from there through the nozzles 7', the tubes 8 and the headbox inlet 11 into the headbox 10. As soon as the flow is properly established, a certain level of liquid is maintained in the collector 1. The speed of flow must be sufficient to prevent any flocculation.

The collector 1 has been shown open to the atmosphere but according to the invention it may also be closed in its upper part and then kept under pressure or under a vacuum so as to form a sheet of air between the top of the liquid in the collector and the upper wall of the collector.

The number and diameter of apertures 7 and consequently of nozzles 7' and tubes 8 will vary according to the Width of the machine, the maximum feed and the height available between the top of the collector and the maximum level provided in the headbox in operation in the case where the headbox and collector are open to the atmosphere or the corresponding manometric height which is available in the case where the collector and/or the headbox are closed and subjected either to a vacuum or to pressure. The greater the number of distributor tubes provided for a given width, the more uniform will be the distribution.

As shown in FIGS. 3 and 4, to maintain the liquid streams parallel, the system according to the invention further consists in partitioning the inlet part 11 of the headbox 10 of the machine and providing in the said inlet a compartment 11 for each tube 8.

To improve the system it is further provided to construct the pulp inlet tube 2 in such a way that it opens into a bottom portion 12a of a box 12 of constant level the outlet aperture 12', to which is connected the feed tube 3, is disposed in the axis of the collector 1 and above the said feed tube 3. In this arrangement, the control valve 4 may be disposed at the lower end of the feed tube, that is to say towards the base of the collector, so that the said constant level box 12 can be sufiiciently close to the collector to prevent any great loss of space in height. An overflow tube 13 is also provided in the constant level box 12.

By means of the delivering system according to the invention it is possible to obtain some idea of the feed rate from the height H between the level of the suspension in the collector and the level in the headbox, and this feed rate can then be determined for a given production (FIG. 2).

With such a system it is possible to divide the initial feed into several equal partial feeds and deliver these partial feeds along a straight line to enter the base of the inlet part of the headbox.

Tests showed that the variations which occurred were relatively very small compared with those that normally occurred. Another by no means negligible advantage which the tests showed was that the uniformity of distribution in the partial feeds is not influenced by the volume of the initial feed.

We claim:

1. Delivering system for a paper-making machine or other machine provided with a headbox and supplied with fibers in suspension, comprising a vertical collector disposed axially of said machine, said collector having a circular wall and a bottom, a feed tube extending into said collector axially thereof, a valve in said feed tube positioned to adjust suspension flow to said collector, an anti-splash ring mounted on said bottom concentric to said collector and surrounding said feed tube, said antisplash ring forming an annular chamber with said circular Wall, said bottom having a plurality of circumferentially arranged, equidistant, downwardly extending nozzles communicating with said chamber, a plurality of distributor tubes connected to said nozzles and extending downwardly from said collector to intersect along an imaginary line, perpendicular to the axial plane of the machine, said tubes extending thereafter parallel to each other and to said axial plane to connect into a compartmented inlet of said headbox.

2. The delivering system according to claim 1, further provided with a box for maintaining a constant level of suspension, said box being disposed axially of said machine and above said collector, said box having a bottom portion provided with an aperture, said feed tube having a top portion connected to said bottom portion at said aperture, said valve being disposed adjacent said bottom portion of the collector and said box provided with an inlet tube and a suspension inlet, and a suspension over flow tube for maintaining a constant suspension level in said box.

References Cited UNITED STATES PATENTS 9/1954 Showers 162-343 8/1966 Staver 1622l6 U.S. Cl. X.R. l62'343 

